Lost1970
The only kabbalistic site that I would vouch for is inner dot org run by Rabbi Yitzchak Ginsburgh. Read his books as well. However I would strongly recommend to first build up a very strong base of knowledge of Halacha and Torah hashkafah before delving into this stuff. Learn plenty mishnayos and Gemarah first. You cant skip the first few floors to jump to the top floor. Theres plenty in nigleh to see before nistar.